Surgery – Truss – Pad
Patent
1988-03-24
1991-04-30
Pellegrino, Stephen C.
Surgery
Truss
Pad
128419PG, 200 6145R, 200 6152, 200DIG2, 200DIG30, 340573, 340686, 340689, A61N 136
Patent
active
050108930
ABSTRACT:
A motion sensor for use within an implantable medical device provides a digital output signal that can be connected directly to the digital processing and control circuits of a pacemaker or other device. This signal may be used to adjust the basic pacing rate of the pacemaker as a function of the physical motion or activity that is sensed. The motion sensor includes an enclosed housing having conductive element therein that partially fills the space of a cavity within the enclosed housing. The conductive element is free to roll, flow or otherwise move around the inside of the housing in response to external forces. The external forces that cause the conductive element to move include the physical motion of the patient as well as the force of gravity. As the conductive element moves within the enclosed housing, it makes electrical contact with at least two of three electrodes that are selectively spaced around the inside periphery of the housing. By monitoring whether and for how long an electrical contact is made or broken between electrodes, a determination is thus made relative to the movement of the conductive element within the housing, and the rapidity with which such movement occurs. This sensed motion is directly related to the physical activity or movement of the patient.
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Matula et al., "A New Mechanical Sensor for the Detection of Body Activity and Posture Suitable for Rate Responsive Pacing", PACE, vol. 10 (Sep.-Oct. 1987).
Gold Bryant R.
Pellegrino Stephen C.
Romano Malcolm J.
Shay David
Siemens-Pacesetter, Inc.
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